Resistor



March 30 1926. 3,578,326

W. J, LARsoN RESISTOR Filed March 7 1925 a/Ln] 35 L i 'lqq HIJ'G 5 61Wif@ 7 4 zz i 4 7 vices,

Patented Mar. 30, 1926.

UNITED STATES WERNER J. LARSON, 0F WEST HARTFORD,

CONNECTICUT. ASSIGNOR TO THE STATES COMPANY, OF HARTFORD, CONNECTICUT,.A CORPORATION OF CONNECTICUT.

RESISTOR.

Application led March 7, 1925. Serial No. 13,742.

To all whom it may concern:

Be it known that I, W nnNru J. LAnsoN, a subject of Sweden, residing atlest Hurtford, in the county of llartt'ord and State of Connecticut,have invented a new and useful Improvement in Resistors, of which thefollowing is a specification.

This invention relates to the construction of resistors or such articlesas are used as heating sistance elements in load boxes, testing deradioapparatus and the like.l

The object of the invention is to provide a very simple, cheap andcompact device of this character which may be readily made in largenumbers and a plurality easily and quickly assembled correct position intheir supporting frames or cases.

This object is attained by forming the active member of a section ofwoven fabric which consists of a warp of non-inflammable and electricalinsulating yarn and a weft of electrical resistance wire, and bindingthis member at its ends with metal strips that are utilized as theelectrical terminals and which are clamped` between cross strips ofinsulating material to the ends of which supporting strips are secured.

In the accompanying drawings, Fig. 1 shows a front view of a resistorconstructed according to this invention. Fig. 2 shows`Y a top view ofthe same. Fig. 3 is an end elevation. Fig. 4 is a front view `of aportion of the resistor, showing the manner of supporting it andcompleting the electrical connection. Fig. 5- is a top view of what isshown in Fig. 4. Fig. 6 is an end view illustrating how severalresistors may be mounted.

The active member or woven fabric is composed of insulating warp strands2 which are desirably asbestos yarn, and a weft 1 of resistance wire ofcommon composition. This member which is more or less flexible isusually woven with selvage edges 3 and it may beA coated with insulatingcomposition to give it suflicient firmness to allow it to be easilyhandled. A section having the desired resistance capacity is cut fromthe woven fabric and the ends of the sections are bound by metal strips4. These strips that form means for stiffening the member vertically andto which the ends of the resistance Wire are connected, as at p. n.,

elements in electric heaters, or rcand firmly retained in' are stampedfrom sheet metal in the form of troughs. After the ends of the fabricnrc inserted 1n the troughs the sues of the ltroughs are squeezedtogether so as to {irmly retain the ends of the fabric and thc wireterminals fastened to them. For the purpose of further stiti'ening thefabric member and providing means for supporting it the binding andterminal strips are connected by flat strips 5 that extend across bothfaces of the fabric. These strips 5 which should be of insulatingmaterial are preferably made of mica, and they are fastened to thebinding strips by tongues 6 stamped out of the binding strips and bentover the mica strips. The ends of the insulating cross strips extendbeyond the binding strips and are fastened to the supporting strips 7,preferably by tongues S stamped out of the supporting strips and bentover the ends of the mica strips. The supporting strips aretrough-shaped sheet metal pieces and are left open so that they may beslipped upon ribs, iianges or guides 9 of the frame or case which is tosupport the resistors. ln a form being made the frame guides arefastened together by bolts 10, and are held properly spaced byseparating sleeves 11 on the bolts. The electrical connections of abattery of these resistors may be made by arranging suitably spacedclips 12 on an insulating bar 13 and simply thrusting the ends of thebinding strips into these clips, as indicated in Fig. 6.

A plurality of these resistors are used according to the requiredcapacity. All of the parts of this resistor are cheap to make, theterminal-binding strips and the supporting strips being folded frompieces of thin sheet metal and the insulating cross strips being fiatpieces of mica, which strips are so fastened together in a simple waythat they perform their several functions and produce a fiat firmarticle which can be easily mounted or assembled in its use w'ith theproper electrical connections.

The invention claimed is:

1. A resistor consisting of a fabric of woven resistance wire andinsulating yarn,

binding strips extending parallel with the 105 resistance wire at theends of the woven fabric and clamping the ends of the insulating yarn,the resistance wire and binding strips, supporting strips spacedfrom andparallel with 110 place of 10g insulating strips extending across thebinding strips and attached to the ends of said insulating strips, andmeans fastening Said strips together.

2. A resistor consisting of a fabric of woven resistance wire andinsulating yarn, binding strips at the ends of the woven fabric,insulating strips connecting the binding strips, and supporting stripsspaced from and parallel with the binding strips and attached to theends of said insulating strips, said strips being "fastened together ytongues stamped from the binding strips and supporting strips and foldedover the'insulating strips, whereby all of said strips are permanentlyfastened together.

3. A resistor consisting of a fabric of Woven resistance wire andinsulating yarn, trough-shaped strips extending parallel with theresistance wire clamping the ends of the yarn and binding the ends ofthe woven fabric, insulating strips extending across the resistance wireand binding strips, and trough-shaped supporting strips spaced from andparallel with the binding strips and attached to the ends of saidinsulating strips.

4. A resistor consisting of a fabric of woven resistance wire andinsulating yarn, vertically arranged binding strips clamping the ends ofthe arn at the ends of the woven fabric, vertical y arranged supportingstrips parallel with the binding strips and spaced therefrom, andhorizontally arranged insulating strips connecting and fastened to thebinding and supporting strips.

5. A resistor consisting of a fabric of woven resistance wire andinsulating yarn, trough-shaped binding strips extending parallel withthe resistance wire and clamped upon the ends of the insulating yarn atthe ends of the woven fabric, mica strips extending across theresistance wire and binding strips on both faces of the fabric, andtrough-sha ed supportin strips parallel to and s ace from the bin ingstrips and attache to the ends of said mica strips.

6. A resistor consistin of a fabric of woven resistance wire anginsulating yarn, U-shaped metallic binding strips extending parallelwith the resistance wire and clam ing the insulating yarn at the ends oftllie woven fabric, insulating strips extending parallel with theinsulating yarn and across said binding strips, U-shaped supportingstrips s ace from the binding strips at the ends o said insulatingstrips, and means fastening said strips together.

7. A resistor consisting of a woven fabric of resista-nce wire andinsulating strands, metallic terminal strips binding opposite ends ofthe fabric, with an electrical connection between the resistance wireand said binding stri s, supporting strips parallel to and space fromthe binding strips, and insulating strips extending across the fabric,the binding and supporting strips and fastened to the binding andsupporting strips.

WERNER J. LARSON.

